I showed how I make a watercolor “canvas” in my post Watercolor Painting of a Sicilian Friendship. Here is a side view of that finished painting.
It is sprayed with about 4 coats of Golden Archival Matte Varnish on both the front and sides for protection. This is a Mineral Spirit Acrylic Aerosol product so follow directions on the can and use in a well-ventilated area.
Once the varnish is dry it is ready to frame or just attach a hanger to the back and hang without a frame for a contemporary look.
Use a wire hanger or saw tooth hanger for wood frames & canvases.
After wrapping the wire around itself I wrapped the sharp ends of wire with masking tape:
This is a large wall hook used for heavy pictures framed with matt and class (holds up to 300lbs.). Smaller hooks may be used for framed paintings without matt or glass and unframed watercolor canvases such as the painting at the top of this page.